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The CyberMOD EC fan retrofit kit for existing computer room air handlers by Stulz-ATS is an economical approach to finding significant fan energy savings in the cooling systems of existing data centers with no modification to infrastructure or floor tile configuration. The CyberMOD uses EC plug fans-direct-drive, single inlet, backward curved radial fans with an electronically commutated (ac to dc motor. Benefits include adjustable fan speed with no VFD, lower running costs, low-maintenance, no belts or belt dust, low-noise operation, built-in redundancy, more efficient than belt-driven motors, and optimized air distribution into the data center raised floor to avoid hot spots. The CyberMOD is available in two- and three-fan configurations and is designed specifically to retrofit Liebert Chilled Water Models 529C and 740C Deluxe System/3.